1 /*- 2 * Copyright (c) 2009 Rick Macklem, University of Guelph 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/ioctl.h> 33 #include <sys/linker.h> 34 #include <sys/module.h> 35 #include <sys/mount.h> 36 #include <sys/socket.h> 37 #include <sys/socketvar.h> 38 #include <sys/stat.h> 39 #include <sys/ucred.h> 40 #include <sys/uio.h> 41 #include <sys/vnode.h> 42 #include <sys/wait.h> 43 44 #include <nfs/nfssvc.h> 45 46 #include <rpc/rpc.h> 47 48 #include <fs/nfs/rpcv2.h> 49 #include <fs/nfs/nfsproto.h> 50 #include <fs/nfs/nfskpiport.h> 51 #include <fs/nfs/nfs.h> 52 53 #include <err.h> 54 #include <errno.h> 55 #include <fcntl.h> 56 #include <grp.h> 57 #include <netdb.h> 58 #include <pwd.h> 59 #include <signal.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <syslog.h> 64 #include <unistd.h> 65 66 /* Global defs */ 67 #ifdef DEBUG 68 #define syslog(e, s) fprintf(stderr,(s)) 69 static int debug = 1; 70 #else 71 static int debug = 0; 72 #endif 73 74 static pid_t children; 75 76 static void nonfs(int); 77 static void reapchild(int); 78 static void usage(void); 79 static void cleanup(int); 80 static void child_cleanup(int); 81 static void nfscbd_exit(int); 82 static void killchildren(void); 83 84 /* 85 * Nfs callback server daemon. 86 * 87 * 1 - do file descriptor and signal cleanup 88 * 2 - fork the nfscbd(s) 89 * 4 - create callback server socket(s) 90 * 5 - set up server socket for rpc 91 * 92 * For connectionless protocols, just pass the socket into the kernel via. 93 * nfssvc(). 94 * For connection based sockets, loop doing accepts. When you get a new 95 * socket from accept, pass the msgsock into the kernel via. nfssvc(). 96 */ 97 int 98 main(int argc, char *argv[]) 99 { 100 struct nfscbd_args nfscbdargs; 101 struct nfsd_nfscbd_args nfscbdargs2; 102 struct sockaddr_in inetaddr, inetpeer; 103 fd_set ready, sockbits; 104 int ch, connect_type_cnt, maxsock, msgsock, error; 105 int nfssvc_flag, on, sock, tcpsock, ret, mustfreeai = 0; 106 char *cp, princname[128]; 107 char myname[MAXHOSTNAMELEN], *myfqdnname = NULL; 108 struct addrinfo *aip, hints; 109 pid_t pid; 110 short myport = NFSV4_CBPORT; 111 socklen_t len; 112 113 if (modfind("nfscl") < 0) { 114 /* Not present in kernel, try loading it */ 115 if (kldload("nfscl") < 0 || 116 modfind("nfscl") < 0) 117 errx(1, "nfscl is not available"); 118 } 119 /* 120 * First, get our fully qualified host name, if possible. 121 */ 122 if (gethostname(myname, MAXHOSTNAMELEN) >= 0) { 123 cp = strchr(myname, '.'); 124 if (cp != NULL && *(cp + 1) != '\0') { 125 cp = myname; 126 } else { 127 /* 128 * No domain on myname, so try looking it up. 129 */ 130 cp = NULL; 131 memset((void *)&hints, 0, sizeof (hints)); 132 hints.ai_flags = AI_CANONNAME; 133 error = getaddrinfo(myname, NULL, &hints, &aip); 134 if (error == 0) { 135 if (aip->ai_canonname != NULL && 136 (cp = strchr(aip->ai_canonname, '.')) != NULL 137 && *(cp + 1) != '\0') { 138 cp = aip->ai_canonname; 139 mustfreeai = 1; 140 } else { 141 freeaddrinfo(aip); 142 } 143 } 144 } 145 if (cp == NULL) 146 warnx("Can't get fully qualified host name"); 147 myfqdnname = cp; 148 } 149 150 princname[0] = '\0'; 151 #define GETOPT "p:P:" 152 #define USAGE "[ -p port_num ] [ -P client_principal ]" 153 while ((ch = getopt(argc, argv, GETOPT)) != -1) 154 switch (ch) { 155 case 'p': 156 myport = atoi(optarg); 157 if (myport < 1) { 158 warnx("port# non-positive, reset to %d", 159 NFSV4_CBPORT); 160 myport = NFSV4_CBPORT; 161 } 162 break; 163 case 'P': 164 cp = optarg; 165 if (cp != NULL && strlen(cp) > 0 && 166 strlen(cp) < sizeof (princname)) { 167 if (strchr(cp, '@') == NULL && 168 myfqdnname != NULL) 169 snprintf(princname, sizeof (princname), 170 "%s@%s", cp, myfqdnname); 171 else 172 strlcpy(princname, cp, 173 sizeof (princname)); 174 } else { 175 warnx("client princ invalid. ignored\n"); 176 } 177 break; 178 default: 179 case '?': 180 usage(); 181 } 182 argv += optind; 183 argc -= optind; 184 185 if (argc > 0) 186 usage(); 187 188 if (mustfreeai) 189 freeaddrinfo(aip); 190 nfscbdargs2.principal = (const char *)princname; 191 if (debug == 0) { 192 daemon(0, 0); 193 (void)signal(SIGTERM, SIG_IGN); 194 (void)signal(SIGHUP, SIG_IGN); 195 (void)signal(SIGINT, SIG_IGN); 196 (void)signal(SIGQUIT, SIG_IGN); 197 } 198 (void)signal(SIGSYS, nonfs); 199 (void)signal(SIGCHLD, reapchild); 200 201 openlog("nfscbd:", LOG_PID, LOG_DAEMON); 202 203 pid = fork(); 204 if (pid < 0) { 205 syslog(LOG_ERR, "fork: %m"); 206 nfscbd_exit(1); 207 } else if (pid > 0) { 208 children = pid; 209 } else { 210 (void)signal(SIGUSR1, child_cleanup); 211 setproctitle("server"); 212 nfssvc_flag = NFSSVC_NFSCBD; 213 if (nfssvc(nfssvc_flag, &nfscbdargs2) < 0) { 214 syslog(LOG_ERR, "nfssvc: %m"); 215 nfscbd_exit(1); 216 } 217 exit(0); 218 } 219 (void)signal(SIGUSR1, cleanup); 220 221 if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 222 syslog(LOG_ERR, "can't create udp socket"); 223 nfscbd_exit(1); 224 } 225 memset(&inetaddr, 0, sizeof inetaddr); 226 inetaddr.sin_family = AF_INET; 227 inetaddr.sin_addr.s_addr = INADDR_ANY; 228 inetaddr.sin_port = htons(myport); 229 inetaddr.sin_len = sizeof(inetaddr); 230 ret = bind(sock, (struct sockaddr *)&inetaddr, sizeof(inetaddr)); 231 /* If bind() fails, this is a restart, so just skip UDP. */ 232 if (ret == 0) { 233 len = sizeof(inetaddr); 234 if (getsockname(sock, (struct sockaddr *)&inetaddr, &len) < 0){ 235 syslog(LOG_ERR, "can't get bound addr"); 236 nfscbd_exit(1); 237 } 238 nfscbdargs.port = ntohs(inetaddr.sin_port); 239 if (nfscbdargs.port != myport) { 240 syslog(LOG_ERR, "BAD PORT#"); 241 nfscbd_exit(1); 242 } 243 nfscbdargs.sock = sock; 244 nfscbdargs.name = NULL; 245 nfscbdargs.namelen = 0; 246 if (nfssvc(NFSSVC_CBADDSOCK, &nfscbdargs) < 0) { 247 syslog(LOG_ERR, "can't Add UDP socket"); 248 nfscbd_exit(1); 249 } 250 } 251 (void)close(sock); 252 253 /* Now set up the master server socket waiting for tcp connections. */ 254 on = 1; 255 FD_ZERO(&sockbits); 256 connect_type_cnt = 0; 257 if ((tcpsock = socket(AF_INET, SOCK_STREAM, 0)) < 0) { 258 syslog(LOG_ERR, "can't create tcp socket"); 259 nfscbd_exit(1); 260 } 261 if (setsockopt(tcpsock, 262 SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0) 263 syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %m"); 264 /* sin_port is already set */ 265 inetaddr.sin_family = AF_INET; 266 inetaddr.sin_addr.s_addr = INADDR_ANY; 267 inetaddr.sin_port = htons(myport); 268 inetaddr.sin_len = sizeof(inetaddr); 269 if (bind(tcpsock, 270 (struct sockaddr *)&inetaddr, sizeof (inetaddr)) < 0) { 271 syslog(LOG_ERR, "can't bind tcp addr"); 272 nfscbd_exit(1); 273 } 274 if (listen(tcpsock, 5) < 0) { 275 syslog(LOG_ERR, "listen failed"); 276 nfscbd_exit(1); 277 } 278 FD_SET(tcpsock, &sockbits); 279 maxsock = tcpsock; 280 connect_type_cnt++; 281 282 setproctitle("master"); 283 284 /* 285 * Loop forever accepting connections and passing the sockets 286 * into the kernel for the mounts. 287 */ 288 for (;;) { 289 ready = sockbits; 290 if (connect_type_cnt > 1) { 291 if (select(maxsock + 1, 292 &ready, NULL, NULL, NULL) < 1) { 293 syslog(LOG_ERR, "select failed: %m"); 294 nfscbd_exit(1); 295 } 296 } 297 if (FD_ISSET(tcpsock, &ready)) { 298 len = sizeof(inetpeer); 299 if ((msgsock = accept(tcpsock, 300 (struct sockaddr *)&inetpeer, &len)) < 0) { 301 syslog(LOG_ERR, "accept failed: %m"); 302 nfscbd_exit(1); 303 } 304 memset(inetpeer.sin_zero, 0, 305 sizeof (inetpeer.sin_zero)); 306 if (setsockopt(msgsock, SOL_SOCKET, 307 SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0) 308 syslog(LOG_ERR, 309 "setsockopt SO_KEEPALIVE: %m"); 310 nfscbdargs.sock = msgsock; 311 nfscbdargs.name = (caddr_t)&inetpeer; 312 nfscbdargs.namelen = sizeof(inetpeer); 313 nfssvc(NFSSVC_CBADDSOCK, &nfscbdargs); 314 (void)close(msgsock); 315 } 316 } 317 } 318 319 static void 320 usage(void) 321 { 322 323 errx(1, "usage: nfscbd %s", USAGE); 324 } 325 326 static void 327 nonfs(int signo __unused) 328 { 329 syslog(LOG_ERR, "missing system call: NFS not available"); 330 } 331 332 static void 333 reapchild(int signo __unused) 334 { 335 pid_t pid; 336 337 while ((pid = wait3(NULL, WNOHANG, NULL)) > 0) { 338 if (pid == children) 339 children = -1; 340 } 341 } 342 343 static void 344 killchildren(void) 345 { 346 347 if (children > 0) 348 kill(children, SIGKILL); 349 } 350 351 /* 352 * Cleanup master after SIGUSR1. 353 */ 354 static void 355 cleanup(int signo __unused) 356 { 357 nfscbd_exit(0); 358 } 359 360 /* 361 * Cleanup child after SIGUSR1. 362 */ 363 static void 364 child_cleanup(int signo __unused) 365 { 366 exit(0); 367 } 368 369 static void 370 nfscbd_exit(int status __unused) 371 { 372 killchildren(); 373 exit(status); 374 } 375